The Mysterious Underground Water Palace in Istanbul, Turkey.

The Basilica Cistern, also known as the Underground Water Palace, is a historical site in Istanbul, Turkey. Built in the 6th century, the cistern was originally a massive reservoir used to store drinking water for the city. The entire cistern is made up of dozens of underground pools, with the largest pool capable of holding over 8,000 cubic meters of water. The cistern is supported by 336 marble columns, each 9 meters high, arranged in 12 rows and 28 columns, resembling towering trees in a vast hall. Each column is intricately carved with beautiful patterns. The interior of the cistern is very humid, and the dim lighting adds to its mysterious atmosphere. Inside the cistern, there is a "wishing pool" with two large Medusa statues, placed sideways and upside down, with no known reason for their orientation.